diff --git a/src/engine/platform/amiga.cpp b/src/engine/platform/amiga.cpp
index 6eaa10d44..37211ef65 100644
--- a/src/engine/platform/amiga.cpp
+++ b/src/engine/platform/amiga.cpp
@@ -180,6 +180,10 @@ int DivPlatformAmiga::dispatch(DivCommand c) {
       chan[c.chan].keyOff=true;
       chan[c.chan].std.init(NULL);
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_INSTRUMENT:
       if (chan[c.chan].ins!=c.value || c.value2==1) {
         chan[c.chan].ins=c.value;
diff --git a/src/engine/platform/arcade.cpp b/src/engine/platform/arcade.cpp
index 1713e9d8f..f3badf19c 100644
--- a/src/engine/platform/arcade.cpp
+++ b/src/engine/platform/arcade.cpp
@@ -532,6 +532,14 @@ int DivPlatformArcade::dispatch(DivCommand c) {
       chan[c.chan].keyOff=true;
       chan[c.chan].active=false;
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+      chan[c.chan].keyOff=true;
+      chan[c.chan].active=false;
+      chan[c.chan].std.release();
+      break;
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_VOLUME: {
       chan[c.chan].vol=c.value;
       if (!chan[c.chan].std.hasVol) {
diff --git a/src/engine/platform/ay.cpp b/src/engine/platform/ay.cpp
index b45749602..590d577b0 100644
--- a/src/engine/platform/ay.cpp
+++ b/src/engine/platform/ay.cpp
@@ -202,6 +202,10 @@ int DivPlatformAY8910::dispatch(DivCommand c) {
       chan[c.chan].active=false;
       chan[c.chan].std.init(NULL);
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_VOLUME: {
       chan[c.chan].vol=c.value;
       if (!chan[c.chan].std.hasVol) {
diff --git a/src/engine/platform/ay8930.cpp b/src/engine/platform/ay8930.cpp
index 9bbc8084f..bd616fc84 100644
--- a/src/engine/platform/ay8930.cpp
+++ b/src/engine/platform/ay8930.cpp
@@ -243,6 +243,10 @@ int DivPlatformAY8930::dispatch(DivCommand c) {
       chan[c.chan].active=false;
       chan[c.chan].std.init(NULL);
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_VOLUME: {
       chan[c.chan].vol=c.value;
       if (!chan[c.chan].std.hasVol) {
diff --git a/src/engine/platform/c64.cpp b/src/engine/platform/c64.cpp
index 2add935ff..2e544924e 100644
--- a/src/engine/platform/c64.cpp
+++ b/src/engine/platform/c64.cpp
@@ -195,6 +195,14 @@ int DivPlatformC64::dispatch(DivCommand c) {
       chan[c.chan].keyOff=true;
       //chan[c.chan].std.init(NULL);
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+      chan[c.chan].active=false;
+      chan[c.chan].keyOff=true;
+      chan[c.chan].std.release();
+      break;
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_INSTRUMENT:
       if (chan[c.chan].ins!=c.value || c.value2==1) {
         chan[c.chan].insChanged=true;
diff --git a/src/engine/platform/gb.cpp b/src/engine/platform/gb.cpp
index 3b9d2d2c6..cf3708f43 100644
--- a/src/engine/platform/gb.cpp
+++ b/src/engine/platform/gb.cpp
@@ -237,6 +237,10 @@ int DivPlatformGB::dispatch(DivCommand c) {
       chan[c.chan].keyOff=true;
       chan[c.chan].std.init(NULL);
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_INSTRUMENT:
       if (chan[c.chan].ins!=c.value || c.value2==1) {
         chan[c.chan].ins=c.value;
diff --git a/src/engine/platform/genesis.cpp b/src/engine/platform/genesis.cpp
index 7c5a84e78..76c2dab39 100644
--- a/src/engine/platform/genesis.cpp
+++ b/src/engine/platform/genesis.cpp
@@ -495,6 +495,18 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
       chan[c.chan].keyOff=true;
       chan[c.chan].active=false;
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+      if (c.chan==5) {
+        dacSample=-1;
+        if (dumpWrites) addWrite(0xffff0002,0);
+      }
+      chan[c.chan].keyOff=true;
+      chan[c.chan].active=false;
+      chan[c.chan].std.release();
+      break;
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_VOLUME: {
       chan[c.chan].vol=c.value;
       if (!chan[c.chan].std.hasVol) {
diff --git a/src/engine/platform/nes.cpp b/src/engine/platform/nes.cpp
index 34281026b..3fb1322a3 100644
--- a/src/engine/platform/nes.cpp
+++ b/src/engine/platform/nes.cpp
@@ -289,6 +289,10 @@ int DivPlatformNES::dispatch(DivCommand c) {
       chan[c.chan].keyOff=true;
       chan[c.chan].std.init(NULL);
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_INSTRUMENT:
       if (chan[c.chan].ins!=c.value || c.value2==1) {
         chan[c.chan].ins=c.value;
diff --git a/src/engine/platform/pce.cpp b/src/engine/platform/pce.cpp
index c0c1f00e1..96b0f024d 100644
--- a/src/engine/platform/pce.cpp
+++ b/src/engine/platform/pce.cpp
@@ -272,6 +272,10 @@ int DivPlatformPCE::dispatch(DivCommand c) {
       chan[c.chan].keyOff=true;
       chan[c.chan].std.init(NULL);
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_INSTRUMENT:
       if (chan[c.chan].ins!=c.value || c.value2==1) {
         chan[c.chan].ins=c.value;
diff --git a/src/engine/platform/saa.cpp b/src/engine/platform/saa.cpp
index 6e23569c2..c9301594a 100644
--- a/src/engine/platform/saa.cpp
+++ b/src/engine/platform/saa.cpp
@@ -177,6 +177,10 @@ int DivPlatformSAA1099::dispatch(DivCommand c) {
       chan[c.chan].active=false;
       chan[c.chan].std.init(NULL);
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_VOLUME: {
       chan[c.chan].vol=c.value;
       if (!chan[c.chan].std.hasVol) {
diff --git a/src/engine/platform/sms.cpp b/src/engine/platform/sms.cpp
index af7629ecd..08e853b74 100644
--- a/src/engine/platform/sms.cpp
+++ b/src/engine/platform/sms.cpp
@@ -127,6 +127,10 @@ int DivPlatformSMS::dispatch(DivCommand c) {
       rWrite(0x9f|c.chan<<5);
       chan[c.chan].std.init(NULL);
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_INSTRUMENT:
       chan[c.chan].ins=c.value;
       //chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
diff --git a/src/engine/platform/tia.cpp b/src/engine/platform/tia.cpp
index e29e01009..6a6ff2628 100644
--- a/src/engine/platform/tia.cpp
+++ b/src/engine/platform/tia.cpp
@@ -144,6 +144,10 @@ int DivPlatformTIA::dispatch(DivCommand c) {
       chan[c.chan].active=false;
       chan[c.chan].std.init(NULL);
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_VOLUME: {
       chan[c.chan].vol=c.value;
       if (!chan[c.chan].std.hasVol) {
diff --git a/src/engine/platform/ym2610.cpp b/src/engine/platform/ym2610.cpp
index 4e99b4f01..84711fc88 100644
--- a/src/engine/platform/ym2610.cpp
+++ b/src/engine/platform/ym2610.cpp
@@ -416,6 +416,22 @@ int DivPlatformYM2610::dispatch(DivCommand c) {
       chan[c.chan].active=false;
       chan[c.chan].std.init(NULL);
       break;
+    case DIV_CMD_NOTE_OFF_ENV:
+      if (c.chan>6) {
+        immWrite(0x100,0x80|(1<<(c.chan-7)));
+        break;
+      }
+      if (c.chan>3) {
+        chan[c.chan].std.release();
+        break;
+      }
+      chan[c.chan].keyOff=true;
+      chan[c.chan].active=false;
+      chan[c.chan].std.release();
+      break;
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
     case DIV_CMD_VOLUME: {
       chan[c.chan].vol=c.value;
       if (!chan[c.chan].std.hasVol) {